char *strcpy(char *src){
    int n=0;
    int i;
    char *t=src;
    char *p;
    while(*p!='\0'){
        n++;
        t++;
    }
    p=(chr*)malloc(sizeof(char)*(n+1));
    for(i=0;i<n;i++){
        p[i]=src[i];
    }
    p[n]='\0';
    return p;
}
